Fix teardown of a couple of test suites

content/browser/renderer_host/media/media_stream_manager_unittest.cc

Index: content/browser/renderer_host/media/media_stream_manager_unittest.cc
diff --git a/content/browser/renderer_host/media/media_stream_manager_unittest.cc b/content/browser/renderer_host/media/media_stream_manager_unittest.cc
index cdf857a8f7ccb7bca8bee89b025270823eceea0f..9450daa742b2a4ad912dba58a1ccf9e952b4d927 100644
--- a/content/browser/renderer_host/media/media_stream_manager_unittest.cc
+++ b/content/browser/renderer_host/media/media_stream_manager_unittest.cc
@@ -170,7 +170,13 @@ class MediaStreamManagerTest : public ::testing::Test {
     media_stream_manager_.reset(new MediaStreamManager(audio_manager_.get()));
 }
 
-  virtual ~MediaStreamManagerTest() {
+  ~MediaStreamManagerTest() override {
+    // Since the main thread of this test suite is the IO thread,
+    // we need to flush it to clear any pending operations before
+    // deleting the MSM.
+    base::RunLoop loop;
+    loop.RunUntilIdle();
+    media_stream_manager_->WillDestroyCurrentMessageLoop();
   }
 
   MOCK_METHOD1(Response, void(int index));